[MPlayer-users] audio codec question

[wes]

I try to play a file, but mplayer gives me this:

======= WAVE Format =======
Format Tag: 309 (0x135)
Channels: 2
Samplerate: 8000
avg byte/sec: 2181
Block align: 11
bits/sample: 0
cbSize: 0
===========================
demux_audio: audio data 0x3A - 0x8A0D2
Audio file detected.
==========================================================================
Cannot find codec for audio format 0x135.
Read DOCS/HTML/en/codecs.html!

Google tells me that 0x135 is Sipro Lab Telecom  ACELP.KELVIN.

Anyone have any idea where I can find a codec to decode audio in this
format? Or, if there is a more appropriate place to ask?

thanks,
-wes